US865857A - Machine for punching. - Google Patents

Description

No. 865,857. PATBNTED ISEPT. 1o, 1907.

s. c. BOND.

MACHINE PoR PUNGHING.

APPLIOLTION FILED DBO.23,1902.

W L -W 2% n If 3 C. BOND, OF WILMINGTON, DELAWARE.

MACHINE son PUNGHING.

Y No. 865,857'.

specification of Letters Patent.

Patented' sept. 1o, 1907.

Y Application ledDecember 23,1902. SerialNo: 136,891.

To all whom 'it may concern:

Be it known that I, SAMUEL C. BOND, a citizenof the United States, residing at Wilmington, in the county of Newcastle, State of Delaware, have invented a new and useful Improvement in Machines for Punching, of

which the following is a specification.

My invention relates to a machine for punching, which will supply the pressure to the punch plunger only in such amounts as will be required to remove the from the reservoir 18 to the cylinder 11 but permits a required amount of material from the article to be punched.

lt further consists of novel details of construction, all as will be hereinafter setforth.

Figure 1 represents a sectional view and partial side elevation of a punching machine embodying my invention. Fig. 2 represents a front view with'valves and ports shown in section." Fig. 3 represents a sectional view of the punch showing the relative position of the punch, slug, plate and die after the material has been sheared. Y Reierring to the drawings: 1 designates the hook or I frame to which is secured the die block 2 and the high pressure cylinder 3, in which reciprocates the punch plunger 4 carrying withA it the punch 5, the punch nut 6 and the packing leather 7 and the pull-back gland 8, said packing being situated between the gland 8 and the plunger 4. i 4

To the high pressure cylinder 3 is secured the diaphragm 9 which has secuied thereto the cylinder head 10 and cylinder or casing 11. Y

12 is the piston which reciproeates in the cylinder' 11 ahd to which is secured the rod 13, which passes through the cylinder head 10 and has theyenlargd portion 14 and on one end the head 15, which is adapted to engage e with the pulllhack gland 8 and the, end o the chamber 16 respectively, at or near the end of the stroke of the piston 12.

17 is the high pressure packing which is situated betweenthe gland 8 'and the reservoir V18 and in conjunction with tlie enlargedportion 14 of the rod 13, forms a closure for the communication between the high pres-- sure cylinder 3 and thesaid low pressure reservoir 18, which is formed by the diaphragm 9 and the cylinder head 10. p e

19 is the low pressure packing w pressure gland 20 around the rod 13 events all 'flow-- ilow to take place in the reverse direction'.

` 21 is the filling plug by which a liquid i's admitt to the reservoir 18. i

22 is a stop ring which limits the t 4` plunger 4, through the stripper 23 an 25 represents the valve chamber, the projecting -endv 25a of which serves asa grip ,for the hand, said valve 3-1 being readily operated by the thumb of the hand holding the gripr25l and as will readily be seen the reaction with the 10W.:

due to the operation of said valve is absorbed between the valve 3l and the grip 25" instead of the valve and the inertia ofthe machine, as in machines constructed l heretofore; this feature enables the operator to operate the valve without disturbing the relation oi the machineto the work. This chamber contains the admission port/26 and has the controlling ports 27 and 28, one

,of Awhich communicates with the upper portion of the interior of the cylinder 11 while the other communicates with the lower portion, said chamber 25 having also the lexhaust ports 29 and`730,

31 is the balanced controlling valve operatedlby the thumb or finger said valve 31 being readily operated by the thumb ef the hand holding theshell ormingthe valve chamber 25.

38 represents the punch in the act of pushing the slug 39 from the plate 40 through the die 41. Y

The op eration is as follows The reservoir 18 is filled with a suitable liquid, the hose or other fluid conveyer is attached to the admission port 26 withthe controlling lvalve 31 in the position shown, the motive fluid passing from the port 26 through the port 27 and packing 19 to the reservoir 18 and b'etween the piston 12 and the cylinder head 10 thereby holding the punch plunger 4 at one end of its travel by the head 15 and the gland` 8 against the pressure of the motive fluid on the liquid in the reservoir 18, which liquid will be readilr seen, exerts a pressure on the punch plunger 4by passing between the high pressure packing 17 and the shaft 13. The material to .be operated upon is then placed on the die 24 and the valve is then moved connecting the port 27 with the exhaust port 29 exhausting the ...motive fluid `irom between the cylinder head 10 and the piston 12 but not from the reservoir 18; the pressure on the iuid being retained by the packing 19, the valve, at the `same time, 'admits the motive fluid through the ports 26 and 28'between the piston 12 and the cylinder l1, causing the piston 12 and the rod V13 to move sov towards the head 10, the punch plunger 4 at the same l time moves toward the die 24, which action is due to the pressure of the motive iuid in the reservoir 18 'Y .being exerted uponthe liquid in the same and ceases when the punchcomes in contact with the material tobe punched. The piston 12in the meantime has been moving towards the head 10 but keeping in the same fprelative 'position-with respect to 'the punch plunger -Aand as it v continues to move inthe same direction it oses communication between the high pressure cylineservoir 18 by the'enlarged portion 14 of s the rod\13 entering the-high pressure packing 17 and forming anfeffective closureQA VThis action causes the pressure inthe high pressure cylinder .3 to become intensified-due to the iperence in area of the piston 12 i121'4 of the rod 13. The inten.- V ed on the punch plunger 4 until the enlarged portion 14 of the rod 13 has passed entirely through the high pressure packing 17, the punch 5 and slug 39 are then in the position shown in Fig. 3 and communication is again established between the reservoir18 and the high pressure cylinder 3, causing the punch plunger 4 to continue its travel under direct pressure until arrested by the stop ring 22. This contrnuatron of the travel is due partly to the direct action of the motive iiuid on the piston 12 through the rod 13 and head 15 on the end f the chamber 16 and partly to the pressure of the motive fluid on the liquid in the `reservoirxl8 acting on the plunger 4. The valve is fore, desire to be limited in every Ainstance to the exact construction herein shown and described.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In a punching machine, a punch plunger and mea/ns for operating the same, said means comprising provision for a maximum pressure and for automatically reducing that pressure, the maximum pressure being exerted during the performance of the vWork and the reduced pressure during the expulsion of the slug. 'l

`2. In a punching machine, a punch and' die and means for operating the same, said means comprising provision for a maximum pressure for shearing the material and for automatically reducing such pressure and a reservoir of power for storing sucient pressure to expel the material sheared.

3. In a punching machine, a high pressure cylinder, a low pressure r'eser'voir, a plunger, a rod therefor adapted to4 reciprocate in said cylinder andreseryolrfand means for exerting a low pressure at -the beginning and ending of the str'oke of the plunger and for exertinga .maximum pressure.

4. In a punching machine, a high pressure cylinder', a low pressure reservoir in communication with' said cylinder, a piston, a r'od for said piston and an enlarged portion on said rod, and lpacking which isndapted to closely fit said enlarged portion when the same passes thereinto to prevent communication between'tbe high pressure cylinder Vand low .pressure reservoir; said enlarged portion passing completely through said packing thereby, again establishing communication between said high pressure cylinder and low pressurereservoir.

5. I n a punching machine, a cylinder, a punch plunger adapted to reciprocate 'in said'cylinder, a r'eservoir in communication with said cylinder means for intensifying pressure vrithiu said cylinder, a closure for Vsaid communicatlon while intensifying the pressure in said cylinder and means of again establishing said communication dur'- ing 'the travel of said punch plunger' in same direction.

'6. ln a punching machine, a high pressure cylinder, a low pr'essure reservoir, a rod having a head which is adapted to reciprocate in said cylinderfa plunger', a gland secured thereto with which said head is adapted to engage on'the return stroke, a packing between saidcylnder and said reser'voir, an enlarged portion of said r'od adapted to form a closure with' said packingT between saidcylinder and said reservoir, a sec'ond cylinder, a piston connected with said ,rod and adapted'to reciprocate in said cylinder',

and means for contacting the motive fluid on either side of said piston as required.

7.1In a punching machine, a high pressure cylinder, al

SAML. C. BOND.-

Witnesses:

GEORGE ARMOR, W. V. BOND.

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